先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 06:33:51
![先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,](/uploads/image/z/2605262-14-2.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%9A5x%26%23178%3B-%EF%BC%BB2xy-3%EF%BC%881%2F3xy%2B2%EF%BC%89%2B4x%26%23178%3B%EF%BC%BD%E6%B1%82%E8%BF%87%E7%A8%8B%E5%92%8C%E7%AD%94%E6%A1%88%2C)
x){gu
:OzmlzڰYjʆֺ65~P߸RNm={Z^o餞k<[ءcTOslh?tOin4 2j5+
4
AD6yvPڀ9D:n4j hC:*
vHYWWNY- z{֥zЄ( f
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
解原式=5x2-[2xy-xy-6+4x2]
=5x2-xy+6-4x2
=x2-xy+6
5x²-[2xy-3(1/3xy+2)+4x²]
=5x²-[2xy-xy-6+4x²]
=5x²-2xy+xy+6-4x²
=x²-xy+6
把x,y的值代入求值。
x²-xy+6